题目

Shopping online can provide ______ convenience and choice, but not ______ websites are safe enough for shopping. A．either; both B．neither; any C．both; both   D．both; all   答案：D下列动物的行为不属于鸟类生殖行为的是①受精   ②筑巢   ③化蛹   ④育雏   ⑤结茧   ⑥孵化   ⑦跳舞A.①②B.②⑦C.④⑥D.③⑤