Smog-choked Southern California (demands) them. It's a car for people who never want to go to (a) gas station again. But the fact is, for all the talk, selling (gas-less) machines has been a (hard-sell).

单项选择题Switzerland is (best) known for its (majesty) mountain range and (thousands) flock to the Alps each year to take advantage of (their) ideal skiing conditions.

单项选择题In deciding to undertake dangerous pursuits, people (usually strive) for their maximum personal ability rating, (when) they (are challenged) but can be victorious, rather than merely (surmounting the mediocre).