血浆脂质是与载脂蛋白结合成脂蛋白的形式运输，故高脂血症又称为高脂蛋白血症，根据血浆脂蛋白和血脂变化，高脂血症可分为6型，不同的类型可表现出CM升高，LDL升高，LDL及VLDL同时升高，IDL升高，VLDL升高，VLDL及CM同时升高，TG升高，TC升高等。

CM、TG和TC均升高的高脂血症类型是（）

A.Ⅰ型高脂血症

B.Ⅱa型高脂血症

C.Ⅱb型高脂血症

D.Ⅲ型高脂血症

E.Ⅳ型高脂血症

The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. (51) these wide modern roads are generally smooth and well maintained, with (52) sharp curves and many straight sections, a direct route is not always the most (53) one. Large highways often pass by scenic areas and interesting small towns. Furthermore, these highways generally (54) large urban centers which means that they become crowded with heavy traffic during rush hours, (55) the "fast, direct" way becomes a very slow route.

However, there is almost always another route to take (56) you are not in a hurry. Not far from the (57) new "super highways", there are often older, less heavily traveled roads which go through the countryside. (58) of these are good two-lane roads; others are uneven roads curling through the country. These secondary routes may go up steep slopes, along high cliffs, or down frightening hillsides to towns (59) in deep valleys. Through these less direct routes, longer and slower, they generally go to place where the air is clean and the scenery is beautiful, and the driver may have a (60) to get a fresh, clean view of the world.

53（）。

A. terrible

B. possible

C. enjoyable

D. profitable