Reading passages

16-According to the passage, acetylsalicylic acid, or Aspirin …… .
A) was first sold in powder form
B) was invented in Germany in 1899
C) was sold to the public in 1853
D) was perfected in 1915
E) was originally produced in pill form
17- It's clear from the passage that Aspirin's medical value
A) was made known by Heinrich Dresser
B) was available to the public from 1853
C) was publicised by Karl Gerhardt
D) led to the creation of a newspaper
E) as a painkiller was widely recognised in 1853
18- The author states that Aspirin……… .
A) has been available in tablet form since 1899
B)became popular worldwide In 1899
C) was first sold by Bayer in 1915
D)was Initially only available after seeing a doctor
E) was commonly used in Germany prior to 1915
The Sahara desert in north Africa stretches eastwards from the Atlantic to the Red Sea and southwards from the Mediterranean to the grasslands and tropical forests of equatorial Africa. It has an area of about 8 million square kilometres and is the world's largest desert region. The world’s highest temperatures have been recorded in the Western Sahara. The traditional inhabitants have been the nomadic Berbers and Arabs moving from oasis to oasis: but vast areas remain totally uninhabited. There is the evidence of recent severe draughts in parts of Nigeria and neighbouring countries to suggest that the Sahara is expanding southwards. On the other hand, there are plans to irrigate some areas; also, the desert has valuable deposits of oil, iron ore phosphates and uranium.
19- The passage tells us that the Sahara desert …… .
A) contains grasslands and tropical forests
B) is between two oceans to the east and west
C) lies to the south of equatorial Africa
D) covers one eighth of Africa
E) has the Red Sea on its eastern boundary
20- The Berbers and the Arabs of the Sahara …….. .
A) have established major settlements there
B) moved to the area in fairly recent times
C) fight over the right to settle in oasis areas
D) inhabit most areas of the Sahara desert
E) have not settled In the desert but moved around