【单选题】
3. The dog, ____, will be made a good watchdog.
①
to train properly
②
being trained properly
③
properly to train
④
trained properly
【单选题】
3．膝关节的构造与功能叙述错误的是
①
A．是由股胫关节和股膝关节组成的复关节
②
B．大家畜的膝关节囊外前方还有三条强大的膝直韧带，起于膝盖骨止于胫骨，小家畜的
只有一条
③
C．股胫关节囊内有一对交叉的十字韧带和两块软骨构成的半月板
④
D．膝关节属于滑膜连接，既是单轴关节，又是复关节，但只能屈伸
⑤
E．其关节角向前，角顶向后
【单选题】
3. ____teacher came in and there was _____ book in his hand.
①
The; a
②
A; the
③
A; a
④
The; the