a.

1.A serial killer is on the loose!

有个连环杀手正逍遥法外！

2.Several small businesses consolidated to form a large powerful company.

几家企业合并成了家实力雄厚的大型公司。

3.Viewed from the top of Mount Tai, the sunrise was indeed a spectacle.

从泰山顶上看去，日出真是个奇观。

4.A mule is a cross between a mare and a donkey.

骡子是驴的杂交种。

5.A tiglon is a cross between a lion and a tiger.

虎狮是狮子老虎的杂交种。

6.A tigon is a cross between a tiger and a lion.

虎狮是老虎狮子交配的产品。

7.A small room; a cubbyhole; a small secluded room; a small compartment.

有房间，隔间（橱），隐蔽的房间，等等意思。具体翻译要看上下文而定。

8.A picture of a cat on a log is a rebus for catalog.

谜画中有(cat)站在块木头(a log)上, 谜底是catalog(目录)。

9.I'm a renegade, a turncoat, a Scalawag.

我是个叛徒，变节者，流氓。

10.A dime is a tenth of a dollar.

角银币是十分之美元。

11.A chair consists of a seat with a back.

椅子是由椅座椅背构成的。

12.A tenant occupies a flat, a building, a farm, etc but does not own it.

* tenent （房客或佃户）占用公寓、建筑物、农场等，但并非所有者。

13.When a catalytically active enzyme forms a complex with a cofactor a holoenzyme is produced.

酶蛋白辅助因子两者结合成完整分子时，形成具有活力的全酶。

14.A mole is a blemish on a person's skin.

黑痣在人的皮肤上是个疵点。

15.I saw a man leveling a gun at a crow.

我看见个人正用枪瞄准乌鸦。

16.A coin has two sides,a head and a tail.

硬币有正反两面。

17.A larva metamorphose into a chrysalis and then into a butterfly.

幼虫变为蛹，然後再变成蝴蝶。

18.A catalyst is a substance which speeds up a chemical reaction.

催化剂是种能加速化学反应的物质。

19.It is a legal fiction that a corporation is a person.

把团体法人当作个人是种法律上的假设。

20.A small cyme or a small section of a compound cyme.

聚伞花序 Cymule 的聚伞花序或复合聚伞花序的部分。