This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Input: Consider Input: Firstly conceived and still used today for optical storage devices (CD-RW drives, DVD drives, etc.), several manufacturers offer external portable USB hard disk drives, or empty enclosures for disk drives. These offer performance comparable to internal drives, limited by the current number and types of attached USB devices, and by the upper limit of the USB interface (in practice about 30 MB/s for USB 2.0 and potentially 400 MB/s or more for USB 3.0). These external drives typically include a "translating device" that bridges between a drive's interface to a USB interface port. Functionally, the drive appears to the user much like an internal drive. Other competing standards for external drive connectivity include eSATA, ExpressCard, FireWire (IEEE 1394), and most recently Thunderbolt.

Output: Several manufacturers offer what?

Input: Consider Input: Mean speeds vary greatly, but is typically around 1 m (3 ft) per day. There may be no motion in stagnant areas; for example, in parts of Alaska, trees can establish themselves on surface sediment deposits. In other cases, glaciers can move as fast as 2030 m (70100 ft) per day, such as in Greenland's Jakobshavn Isbr (Greenlandic: Sermeq Kujalleq). Velocity increases with increasing slope, increasing thickness, increasing snowfall, increasing longitudinal confinement, increasing basal temperature, increasing meltwater production and reduced bed hardness.

Output: In what area of Greenland can glaciers move 20-30m per day?

Input: Consider Input: The Color Orange democracy group, led by Danish sculptor Jens Galschit, originally planned to join the Hong Kong Alliance relay and paint the "Pillar of Shame", a structure he built in Hong Kong to commemorate the 1989 Tiananmen Square protests. However, Galschit and two other people were denied entry to Hong Kong on April 26, 2008 due to "immigration reasons" and were forced to leave Hong Kong. In response, Lee Cheuk Yan, vice chairman of the Hong Kong Alliance in Support of Patriotic Democratic Movements in China, said, "It's outrageous that the government is willing to sacrifice the image of Hong Kong because of the torch relay." Hollywood actress Mia Farrow was also briefly questioned at the Hong Kong airport though officials allowed her to enter. She later gave a speech criticizing China's relations with Sudan in Hong Kong, as there was also a small minority of people protesting about China's role in the crisis of Darfur. Legislator Cheung Man Kwong have also said the government's decision allowing Farrow to enter while denying others is a double standard and a violation to Hong Kong's one country, two systems policy.
Output: Which group did Jens Galschit lead?