【单选题】What is the main idea of the second paragraph?
A.
Some plants have relative immunity to a great many diseases, while others have a susceptibility to them.
B.
The tolerance of a particular plant changes as the growing conditions change.
C.
A blight killed virtually every chestnut tree in North America.
D.
A blight may be a national infection.
【单选题】一个企业使用资本K和劳动L两种要素生产,如果考虑它的短期生产,这意味着
D.
K和L必有一个来不及改变其使用量,另外一个来得及改变
【单选题】The main point of the passage is ______.
A.
the idle and empty life of the Americans
B.
the great functions of American movies
C.
why American people go to the cinema
D.
the popularity of Hollywood movies
【判断题】若r(A)=r,则A中所有r阶子阵都是非奇异的。
【单选题】一个企业使用资本K和劳动L两种要素生产,如果考虑它的短期生产,这意味着
B.
K和L中必有一个来不及改变其使用量,另外一个来得及改变
【单选题】一个企业使用资本K和劳动L两种要素生产,如果考虑它的短期生产,这意味着
A.
K 和 L 中必有一个来不及改变其使用量,另外一个来得及改变
【单选题】Man: The new Chevy Chase film was terrific! Woman: Oh, come off it, Al. Chevy Chase is a great comedian, but he surely didn't show it in that movie. Question: What does the woman think of the movie?
B.
It's typical Chevy Chase film.
C.
It isn't a good comedy.
D.
It isn't as terrible as A1 thought.
【单选题】一个企业使用资本K和劳动L两种要素生产,如果考虑它的短期生产,这意味着:()
B.
K和L中必有一个来不及改变其使用量,另外一个来得及改变
【单选题】一个企业使用资本K和劳动L两种要素生产,如果考虑它的短期生产,这意味着
C.
K和L中必有一个来不及改变其使用量,另外一个来得及改变
【单选题】一个企业使用资本K和劳动L两种要素生产,如果考虑它的短期生产,这意味着
B.
K和L中必有一个来不及改变其使用量,另外一个来得及改变