【简答题】植物细胞初生壁的主要成分是 。 A .纤维素、半纤维素和果胶 B .木质、纤维素和半纤维素 C .果胶 D .角质和纤维素
【单选题】The American Puritanism as a cultural heritage benefited the Americans in _______.
A.
strengthening their moral values.
B.
weakening their religious faith.
C.
knowing truth intuitively.
D.
developing their science and technology
【单选题】According to the American Heritage Dictionary, a college is an institution of higher ______ where a bachelor's degree is offered for either liberal arts or science or both.
【简答题】任意一个数都可以用直线上的一个点来表示,反过来( )上任意一个点都可以表示一个( )