Q41: Elk now live almost solely in the Rocky Mountains, which would make it seem that elk are mountain dwellers, while they once ranged over virtually all of the continental United States except for a small strip in the extreme Southwest.
- Elk now live almost solely in the Rocky Mountains, which would make it seem that elk are mountain dwellers, while
- The fact that elk now live almost solely in the Rocky Mountains would make it seem that they are mountain dwellers, but
- It would seem that elk would be mountain dwellers because of their living now solely almost in the Rocky Mountains, but still
- Now living almost solely in the Rocky Mountains, it would seem that elk were mountain dwellers, although
- It seems that elk would be mountain dwellers from the fact that they now live solely almost in the Rocky Mountains, since
给出的答案是a,我觉得a中which没有合适的指代对象啊，我选了b. Q20: Researchers have announced that the magnetic fields emitted by one manufacturer’s security surveillance system, of which type there are 200,000 worldwide, can interfere with pacemakers and that this interaction can bring on missed or irregular heartbeats, nausea, breathlessness, dizziness, and even fainting.
A. of which type there are 200,000 worldwide, can interfere with pacemakers and that B. of which, worldwide, there are 200,000 of that type, and which can interfere with pacemakers, and C. of which type there are 200,000 worldwide, they can interfere with pacemakers and D. 200,000 of which type exist worldwide, interfering with pacemakers, and E. 200,000 of that type existing worldwide and can interfere with pacemakers, and 这道题的结构和意思不是很明白,希望得到帮助,答案是d | 
