无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

<tfoot id="mqg2i"><strong id="mqg2i"></strong></tfoot>

<ruby id="mqg2i"><xmp id="mqg2i"></xmp></ruby>

<ruby id="mqg2i"><small id="mqg2i"></small></ruby>

<pre id="mqg2i"><strong id="mqg2i"></strong></pre>

單項(xiàng)選擇題

It is useful to science（）the earth as an object in space.

A.to consider
B.which considers
C.considers
D.the consideration of

你可能感興趣的試題

單項(xiàng)選擇題

We must（）that the experiment is controlled as rigidly as possible.

A.assure
B.secure
C.ensure
D.issue

單項(xiàng)選擇題

Be careful,（）you'll fall down.

A.on the contrary
B.or rather
C.or else
D.as for

<sup id="nm9qb"></sup>